<!DOCTYPE html>
<html lang="en">
<head>
    <script src="https://unpkg.com/vue@3/dist/vue.global.js"></script>
</head>
<body>
    <div id="app">{{ message }}</div>

    <script>
        const { createApp, ref } = Vue;
        createApp({
          setup() {
            
            const message = ref('Hello Vue!');
            return { message };
          }
        }).mount('#app');
    </script>
</body>